The Island Ripple Run returns to Diamond Cove, Great Diamond Island, and Little Diamond Island! This is a 4-mile race around two islands in beautiful Casco Bay, just off the coast of downtown Portland. Participants will enjoy ocean views as this run follows picturesque island roads and wooded paths around Great Diamond Island, over the sandbar that attaches Great Diamond and Little Diamond Islands at low tide, around Little Diamond Island, and ends on the north side of Great Diamond Island near the tent site. All proceeds from this race go to the Dennis Farrell Memorial Scholarship Fund at Rippleffect, located on neighboring Cow Island. The Kids Diamond Dash kicks off the morning followed by the Island Ripple Run. Light refreshments will follow the races.
Jul 19, 2026
Distance — Kids Diamond Dash
Type — Running
09:15
$20.00
Jul 19, 2026
Distance — 4 Miles
Type — Running
09:30
$30.00
These values represent the 3-year monthly averages for July in Great Diamond Island.
Learn more about the host city, Great Diamond Island.
Great Diamond Island is an island located in Casco Bay in Maine and part of the city of Portland.
Read more launchExplore other exciting events happening in this same region.
location_on Portland, Maine, US
calendar_today Apr 18, 2026
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